wanted-70 skylark small black heater control cable for non a/c car,I think it's the one the controls defrost and it connects to the heater core box
There's a thread/posts on here about fixing them - Maybe 2 (one ea. by @Duane & @copperheadgs1). The blue one (can't remember what it controls) almost always breaks.
A company in Texas called “Old Air Products” has a set of three cables (duplicates of the originals) for non-A/C cars 1970-1072 Skylarks, GS, and GSX and they currently have them in stock as of 7/30/2022. You can google their contact info. Great guys!
The only good one I had was the longer version, guessing it was for A/C. Shorter one had started to split on the housing close to the mounting clip. Joe